Trapped inside "prison-like" tents in Bangladesh's refugee camps because of fears they will be trafficked or sexually harassed, teenage Rohingya girls dream of going to school and playing outside, aid agencies said on Wednesday.

Adolescent girls are confined to one-room bamboo and tarpaulin tents so as to avoid men, only venturing out in the early hours to relieve themselves, the children's charity Plan International said on World Refugee Day.

"They spend almost every hour of every day inside their sweltering tents, where the only activities they have to keep themselves occupied are cooking and cleaning," said Orla Murphy, Plan International's Bangladesh director.